Gas-motor.



s. WIGELIUS.

' GAS MOTOR. APPLICATION FILE-D APR.26. 1910.

Ml @59%1 @1 Patented. Apr.13,1915.

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SVEN WIGELIUS, 0F STOCKHOLM, SWEDEN, SSIGNOR T0 AKTIEB'OLAGET WIGELIIUSMOTORER, OlE STOCKHOLM, SWEDEN. l l

GAS-MOTOR.

Maaate.

specincation of Letters Patent.

Patented Apr.. f3, lgvl.

Application filed llpli126, 1910. Serial N0. 557,70.

To aZZ whom t may concern.'

Be it known that l, SVEN WIGELIUS, engineer, a subject of the King ofSweden, and a citizen of Sweden, residing at Kaptensgatan 17, Stockholm,Sweden, have invented new anduseful lmprovements in Gas- Motors, ofwhich the following is a specification.

My invention relates to improvements in devices for injecting liquidfuel into the cylinder ,of an internal combustion engine under pressurewherein the fuel is supplied into the spraying device by means of anauxiliary pump.

According to my present invention a movable sleeve surrounds an aircontrolling spindle or admission valve, said sleeve controlling thepassage of the fuel to and from a main engine pump.

ln the accompanying drawings; Figure l is a longitudinal section of aportion of an engine cylinder equipped in accordance with thisinvention. Fig. 2 is a similar section showing certain of the parts inthe different positions. i

a indicates the motor cylinder, b the eX- haust valve and c a plug,which is removably inserted into the cylinder and in which the vinletvalve device is mounted. This latl ter consists of a reciprocatingregulating spindle (Z, provided with a guide e, and which is surroundedby a sleeve g. 'The interior of the sleeve g is larger than the spin;ille (Z. except at g2 at which point it fits the spindle closely. Thespindle d is reduced at rZ. forming a shoulder orclosure portion d2.

.Ik lplug f surrounds the lower end of the regulating spindle.

The lower end of the sleeve g and the facing ends of the sleeve g andplug fare formed as a valve and valve seat, respectively, and when thesleeve g is lifted an annular space or passage h is formed between saidplug f and sleeve g. The passageh communicates by means of a channel z'with :in oil chamber lc, formed between the piston Z of the auxiliaryypump, and the wall of the plug c. v

The main engine fuel pump, not shown, forces the fuel into the pressurevconduit, n, which communicates through a passage ml with a ring-shapedchamber'o formed in the plug f' on the outer side of the sleeve y) whichis inserted in the said plug C and surrounds the aforementioned sleeve.-ii'iother ring-shaped chamber y is formed inside the sleeve p in thematerial of the,

sleeve g and the ring-shaped chambers o and q communicate with eachother through holes r bored in the sleeve p.' y

'ln the position shown on the drawing, the sleeve g is lifted up fromthe plug f, so that a space is formed between the sleeve g and the plugf, whereas the conmunication between the chamber q and the channel i isclosed, the sleeves p and g abutting tightly against each other at s.

ln this position of the parts no fuel can ,be forced in from the enginepump to the fuel chamber c. On the other hand if the fuel chamber Z:contains fuel from va previous stroke, this fuel can be forced inthrough the channel z' and the space h to the annular space between thespindle d and the plug f by the downward stroke of the auxiliary pistonZ. ln the position shown on the drawing, there is no space betweenspindle d and plug f, but if the spindle is lifted by means o a cam, orthe like (not shown) the space le. will communicate with the annularspace formed between the plug fand the reduced middle part d of thespindle oZ and the fuel thus enters the said annular space and hence issprayed into the cylinder. lf on the other hand the sleeve g is moveddownwardly, by means of a cam or the like, until its lower part abutsagainst the upper part of the plug f, the space Zz. will be closed and aspace formed at s between the fixed sleeve p and the movable sleeve g.lin this position of the parts the fuel having been pressed into thechamber Q, by means of the main engine fuel pump, will pass through theannular space between the plug c and the sleeve g and further throughthe channel z' to the oil chamber k and lill the same with fuel for thenext stroke. lihe downward movement of the auxiliary pump piston Z, thesleeve g and the spindle d is hereby thus regulated in the known mannerby means of cams or the like so that when the vpiston Z moves downwardlythe communication to the channel fm, is closed, the diderent partsoccupying the position shown on'the drawn the operation of this engineit is to be noted that definite quantities or charges of oil are,introduced which are free from air. The purpose of the second orauxiliary pump Z will be understood from thedescription of theoperation.

I lu order to unclerstand the operation let tib it be supposed that Fig.l shows the position of the different parts immediately after theintroduction of a charge and its explosion. A t this time the valve dwill havebeen closed while the valve g isl still raised. Now, as theengine operates the valve g closes on the seat k. At the same time themain pump piston is on its forward stroke so that oil is forced throughthe conduit n. rlhe piston of the pump Z'at this time is raised. Oiltherefore passes through the port m, the

' parts assuming the position shown in Fig. 2.

This oil flows up into the cylinder lo through the passage a. It is tobe p articularly noted that no air enters with the oil at this time.After the cylinder k has been charged with oil the operating'cams causethe lifting of the valve g off its seat h so as to close off the port mand prevent oil flowing back into the main pump. At the proper time forintroducing the charge of oil the valve Z is raised by a suitable camand opens a passage between the cylinder lo and the interior of theengine cylinder a. The piston of the pump Z is at this timemovingdownward-and the oil is forced through the passage between themembers f and g and around the valve d. The parts are so timed that whenthe valve (Z lifts the oil first starts toward the interior of thecylinder a4 and then the valve Z lifts sufficiently to permit air to owinto the cylinder a with the oil, and air pass around said valve d. Allthe time the air is flowing in, the piston of the pump Z is descendingso that no air can pass vinto the cylinder 7c. When the charge has beennearly introduced the valve'oZ moves downward and first closes off theair. The piston of the pump Z continues its downward movement until thisair is closed off. When the air has'been completely closed offT thepiston of the pump Z starts to rise and slightly before this risingmovement the valve d' is seated in its lowermost position and valve gagain assuming the position shown in Fig. 2 just. at the instant ofreversal of movement of the piston in Z. Furthermore the reason why twopumps are used instead of one is: First that the fuel in the oil chambercan always be kept under such a high pressure that the introduction ofthe fuel, even if it contains air and thus is compressible, can takeplace in the right moment and in the right quantities. The pressure inthe air channel into which the fuel is-to be introduced, amounts to 60atmospheres. If, however, the pump which finally causes the introductionshould increase the pressure of the fuel from about 0 to 60 atmospheresbefore the injection had taken place the pump action ought to be verydifferent with dierent quantities of air in the fuel. Secondly the riskof air from the air channel entering the fuel is greatly lessened, forthe quantities of fuel which are to be introduced at last and which arein the oil chamber are under a pressure corresponding to that in thepressure air channel. It is obvious that the injection of the fuel, ifconsiderable quantities of air could enter lthe fuel, must, on thewhole, be very irregular. Y

I claim l. A device for supplying air and fuel to explosive enginescomprising in combination,a plug having a bore delivering to thecylinder of the engine and provided on its intake end with a valve seat,a movable sleeve having a valve for engagement with said seat andcommunicating with the source of supply of air under pressure andadapted to deliver to said plug, a spindle movable in said sleeve andplug for controlling the supply of compressed air to said sleeve and thesupply of oil between said sleeve seat and valve to said plug, a easingsurrounding said plug and sleeve and having a chamber back of saidsleeve valve, aI main pump provided with a passage leading to saidchamber, and an auxiliary pump .communicating with said chamber, saidsleeve having a valve portion closing ingress of fuel from the main pumpto said chamber when the sleeve valve is free from engagement with saidplug sleeve, substantially as described.

2. The combination with a casing provided with a bore having an annulargroove extending there around, said casing further having a chambercommunicating with said groove and a second chamber opening into thebore below the groove a fixed sleeve held in said bore and provided withports opening into said groove, a plug screwed into the lower end ofthebore and provided with an opening extending therethrough having a valveseat located therein, said plug further having a valve seat at the upperend, the fixed sleeve being provided with a valve seat at the lower end,a reeiprocable sleeve provided with a pair of oppositely disposed valvesurfaces adapted to seat on the valve seat at the upper end of the plugand the lower endv of the `fixed sleeve selectively, said reciprocablesleeve having a groove extending therearound adapted to register withthe ports in the fixed sleeve, and a spindle valve movable within thereciproeable sleeve aid adapted to seat on the valve seat in the p ug. y

`In testimony whereof l have signed my name to this specification in thepresence of two subscribing witnesses.

" SVEN WIGELIUS.

HARRY ALBIHU.

